Effect of Loading Path on the Mechanical Properties of Completely Decomposed Granite Soil Based on the Multiscale Method
Effect of Loading Path on the Mechanical Properties of Completely Decomposed Granite Soil Based on the Multiscale Method
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DOI：
10.1155/2021/6635768
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发表时间：
2021-01
影响因子：
1.8
通讯作者：
Yanru Zhao;Tiande Wen;Xiaohui Sun;Liping Huang;Ruirun Chen
中科院分区：
文献类型：
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作者：
Yanru Zhao;Tiande Wen;Xiaohui Sun;Liping Huang;Ruirun Chen
华南地区广泛分布的完整的完全分解花岗岩（CDG）土在受到外部载荷扰动或水浸泡后，其力学性能急剧下降。本研究采用从某建筑工地提取的完整CDG试样，进行了分阶段三轴固结排水（CD）试验和细观扫描，研究了其力学行为和细观孔隙分布。结果表明：应力-应变关系在第一阶段加载时表现为收缩，在第二阶段加载时表现为脆性；裂纹的发育受主应力的影响，主应力使孔隙和裂纹收缩或部分闭合。Esec-1随围压的增加呈线性增加，而Esec-2呈指数下降。
Mechanical properties of intact completely decomposed granite (CDG) soil, widely distributed in South China, decrease drastically as encountering external load-related disturbance or soaked by water. In this study, staged triaxial consolidated drained (CD) test and microscopic scanning were conducted using intact CDG specimens extracted from a construction site to investigate the mechanical behavior and microscopic pore distribution. The results show that the stress-strain relationship reveals a shrinking behavior in the first-stage loading and a brittle behavior in the second-stage loading. The development of cracks is affected by the principal stress, which causes the pores and cracks to shrink or partially close. In addition, Esec-1 increases linearly with the increase of confining pressure, but Esec-2 decreases exponentially.